Dear Julia, again, do yourself a favour and blur/mask your personal data! You can do this by using any image editing application:
As for your ‘problem’…
Go to Settings > Chart of Accounts:
For each of the custom bank accounts you’ve created in the Chart of Accounts (Bank2 and Bank3 in my example), click the Edit button and then use the drop-down list to assign it to the Control account Bank Accounts:
Then go to the Bank Accounts tab, click the Edit button for each of the custom bank accounts you’ve created in the Chart of Accounts, and assign it to the corresponding Control Account (in my example data Bank2 > Bank2 and Bank3 > Bank3):
After doing this you’ll see that the starting balances’ amounts are now included in the balance of each of the custom bank accounts and the Bank Reconciliation will show no differences.